PDSH 973 Flux measurement tolerances

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PDSH 973 # W6 X' L5 t5 c# N4 p

Flux measurement tolerances

22.16 & D; }; q# @% W' R

60598-2-22(ed.3);am1;am2

Standard(s):
IEC 60598-2-22/1997 A1/2002 A2/2008
Subclause(s): 22.16
No. Year PDSH 0973 2010
Category: LITE Developed by: ETF5  OSM/LUM
Subject:
8 k  ^. ~# A8 @7 FFlux measurement tolerances
' x/ D" g. Y: b6 v2 Y& u8 gKey words:
+ B0 V- J* g$ l- Follow up tests
2 g9 e% ]6 t% k* m4 ]- 10% difference
( P/ K: X7 J$ ~1 C% i- Type tests
8 k# h2 ]7 j, m4 T& j) eTo be approved at the 49th CTL Plenary Meeting, in 2012
2 D% b6 W4 w5 n, U$ c1 tQuestion:
When photometric testing is performed to verify the rated flux in emergency mode, we are often faced
1 b; b0 }  ]- N7 ywith differences between our results and those stated by the manufacturer. According to our experiences,
' u! }$ {! t8 L. mthis is quite normal if we take into account the series of uncertainties which affect a photometric
* Y* j5 r8 z7 u- l, wmeasurement: different lamps used by Test Houses and manufacturers, production tolerances as regards
; `4 T* F) |$ a4 y7 G) \+ U" Dbattery and inverter, different testing methodologies, etc. What is the maximum difference allowed so that
: g0 x0 E1 U' r$ j9 `the value declared by the manufacturer is deemed correct?
Decision:
, T( h1 T, c' EFor follow up test, 10% difference is acceptable. For type tests, no tolerance allowed.
$ c4 V/ A/ ]* F1 g+ M